hmi_time_sync_how_to_e

Cover sheet
How do you synchronize the time of
the HMI Basic Panel with a S7-1200
PLC?
S7-1200 PLC, HMI Basic Panel
FAQ  October 2009
Service & Support
Answers for industry.

Question
2
S7-1200_HMI_time_sync
Version 1.0, Entry ID: 39182145
This entry originates from the Service&Support Portal of Siemens AG, Sector
Industry, Industry Automation and Drive Technologies. The conditions of use
specified there apply (www.siemens.com/nutzungsbedingungen).
Go to the following link to download this document.
http://support.automation.siemens.com/WW/view/de/39182145
Question
How do you synchronize the time of the HMI Basic Panel with a S7-1200 PLC?
Answer
Use the system time of your S7-1200 PLC on your HMI Basic Panel by configuring
the relevant tags on your HMI Basic Panel. The necessary steps are explained
using a sample project.

Contents
Version 1.0, Entry ID: 39182145 3
Contents
1 Configuring the S7-1200 PLC........................................................................... 4
1.1 Prepare project..................................................................................... 4
1.2 Configure tags and time functions........................................................ 5
1.3 Download project to PLC ..................................................................... 8
2 Configuring the HMI Basic Panel..................................................................... 9
2.1 Configure HMI Basic Panel .................................................................. 9
2.2 Configure basic screen....................................................................... 10
2.3 Assign tags......................................................................................... 11
2.4 Configure button................................................................................. 12
2.5 Time/date display of the HMI Basic Panel ......................................... 15
3 Using the time functions................................................................................. 16
3.1 Set the PG/PC interface..................................................................... 16
3.2 Display time........................................................................................ 16
3.3 Change system time UTC .................................................................. 17
3.4 Change local time............................................................................... 18

1 Configuring the S7-1200 PLC
4
You create time functions in a project so that you can access the system time UTC
and the local system time via the tags assigned.
1.1 Prepare project
Click on the "Project" menu in the menu bar and then on the menu command
"New...". In the "Create a new project" dialog you enter a name in the "Project
name" input field. Click on the "Create" button to complete the procedure.
Figure 1-1
Incorporate PLC
In the project tree in your project folder, you click on the "Add new device" item. In
the "Add––––– new device" dialog window, you click on the "SIMATIC PLC" button
and in the folder tree you select your PLC model by clicking on the associated
MLFB. Confirm your selection by clicking on the "OK" button.

Figure 1-1
1.2 Configure tags and time functions
Create data block
In the project tree in your PLC's folder, you navigate to the "Program blocks" folder
and double-click on the "Add new block" item to open the associated dialog
window. In the "Add new block" dialog window, you select "Data block" as block
type and in the "Name" input field you specify a name for the data block to be
created. Select "GLOBAL DB" in the "Type" drop-down list box. Click on the "OK"
button to complete the procedure.

6
Figure 1-2
Create tags
In the project tree in your PLC's folder, you navigate to the "Program blocks" folder
and double-click on the data block "db_time_sync [DB1]" to open the associated
dialog window.
In the "Name" column of the data block's dialog window, you click in the next free
field and specify the symbolic name "time_local_READ". Click in the same row in
the "Data type" column and select the data type "DTL" for this tag. Repeat this
procedure for the "time_system_READ" and "time_system_WRITE".

Figure 1-3
Insert and connect time functions in "Main (OB1)"
1. In the project tree, you double-click on the "Main (OB1)" program block to open
the dialog window.
2. From the task card "Instructions" > "Extended instructions" pane > "Date and
time" folder you drag and drop the three time functions "WR_SYS_T",
"RD_LOC_T" and "RD_SYS_T" to three networks of the "Main (OB1)" program
block. Connect the inputs and outputs of the function blocks with the tags
created above. Specify unique marker word addresses for the "RET_VAL"
outputs as shown in the example in Fig. 05.
3. Insert a pulse block from the "Statements" pane > "Bit logic" folder in front of
the "EN" input of the "WR_SYS_T" block. Specify special marker addresses for
the pulse block as shown in the example in Figure 1-5.

8
Figure 1-4
1.3 Download project to PLC
In the project tree, mark the folder of your PLC. Click on the "Download" icon in the
toolbar.
Figure 1-5

2 Configuring the HMI Basic Panel
Insert an HMI Basic Panel in your project. In the basic screen of the HMI Basic
Panel, you implement the accesses to the time functions.
2.1 Configure HMI Basic Panel
Insert HMI Basic Panel in project
In the project tree, you double-click on the "Add new device" item to open the
associated dialog window. In the "Add new device" dialog window, you double-click
on the "SIMATIC HMI" button. Mark your HMI Basic Panel in the folder tree.
Confirm your selection by clicking on the "OK" button. The operator panel wizard
for the selected display opens.
Figure 2-1
Connect HMI Basic Panel with PLC
In the operator panel wizard for the HMI Basic Panel selected, you click on the
drop-down list box to select your PLC. In the drop-down list you double-click on the
PLC to be connected with the HMI Basic Panel. Close the operator panel wizard by
clicking on the "Finish" button.

10
Figure 2-2
2.2 Configure basic screen
Configure a basic screen for your HMI Basic Panel in order to incorporate the time
functions.
Insert objects
In the project tree, open the HMI Basic Panel folder and in the "Screens" folder,
you click on the "Root screen" item. Reproduce the basic screen shown in Fig. 09.
For this, from the "Toolbox" task card you drag and drop the objects required - text
field, IO field and button - from the "Basic objects" and "Elements" panes to the
window of the HMI Basic Panel's root screen.

Figure 2-3
Name text fields
Double-click in the text fields and specify the identifiers from Figure 2-3. Confirm
the entries each time by pressing the "Enter" key.
Name button
Double-click on the button and specify the identifier "Set time". Confirm the entry by
pressing the "Enter" key.
2.3 Assign tags
Float the dialog window of the "db_time_sync" program block
In the project tree, you double-click on the "db_time_sync [DB1]" program block. In
the dialog window of the program block, you click on the icon to float the dialog
window.
Figure 2-4
Connect IO fields with tags
In the project tree, you double-click on the "Root screen". Drag and drop the three
time tags created previously to the three text fields. In the detail window of each IO
field, in the "Properties" tab you see that the format settings have been adopted
automatically.

12
Figure 2-5
2.4 Configure button
Add events to the button to give the button a function.
Add "Click" event
To add an event, you define a function for the event and assign a tag to that
function.
Define "Click" event
In the "Root screen", you click on the "Set time" button.
In the detail window of the button (here: Button_1), in the "Properties" > “General”
tab, you go to the "Events" folder in the navigation area and click on the "Click"
item.
In the table area of the "Properties" tab, you click in the "<Add function>" row and
open the drop-down list box.

Figure 2-6
Set the "SetBit" function
Double-click on the "Edit bits folder and click on the "SetBit" item.

14
Figure 2-7
Assign "write_time" tag
In the "Tag (Iput/output)" row of the set function, you click on the icon at the end of
the cell marked in pink.
In the window that opens, you open your PLC's folder and click on the "PLC tags"
folder. In the table area, you click on the "write_time" tag.
Figure 2-8
Add "Release" event
Proceed in the same way as in "Add "Click" event" to add the "Release" event.
Define "Release" event
Define the "Release" event as you did the "Click" event.
Set the "ResetBit" function
Set the "ResetBit" function for the "Release" event.
Assign "write_time" tag
Assign the "write_time" tag to the "ResetBit" function.

Figure 2-9
2.5 Time/date display of the HMI Basic Panel
Link the area pointer for the time display of the HMI Basic Panel with the
"time_local_READ" tag.
Create area pointer for date/time
In the project tree, open the HMI Basic Panel folder and double-click on the
"Connections ()" item. In the "Connections" dialog window, you select the "Area
pointers" tab for the connection between the HMI Basic Panel and the S7-1200
PLC. In the "Global area pointer of HMI device" area, you go to the row for the
connection to your HMI Basic Panel and from the directory window you select the
"time_local_READ" tag for the "Date/time PLC" display name.
Note
For test purposes, set 2s in the "Acquisition Cycle" column. This fast acquisition
cycle is not necessary for regular operation.
Figure 2-10

3 Using the time functions
16
The system time UTC is the basic time of the S7-1200 PLC. The local system time
is calculated from this by the Time Zone parameter. You can only change the
system time UTC and the time zone.
To check your configured funktions, use the RT Simulator. First set the PG/PC
interface to be able to use the RT Simulator. You can operate the RT Simulator like
an HMI Basic Panel.
3.1 Set the PG/PC interface
Open an Explorer window and enter "Control Panel" in the address bar. Confirm
the entry with the "Enter" key.
In the Control Panel folder you double-click on the "Set PG/PC Interface" item. In
the "Set PG/PC interface" dialog window, open the "Access path" tab and set the
access point "S7ONLINE" to the Ethernet card that is connected with the S7-1200
PLC. Click on the "OK" button to complete the procedure.
Figure 3-1
3.2 Display time
Click on the "Start Runtime" icon in the toolbar.
The RT Simulator opens and displays a picture of the HMI Basic Panel configured.
The system time UTC and the local system time are displayed in their respective
IO fields.
Through the connection of the area pointer the internal time/date display in the top
right corner of the HMI Basic Panel also displays the local time set in the S7-1200
PLC.

Figure 3-2
3.3 Change system time UTC
In the HMI Basic Panel, you enter the date and time in the ">dd.mm.yy hh:mm:ss<"
format in the IO field next to the "Set time" button. Transfer the values entered to
your PLC by clicking on the "Set time" button.

18
Figure 3-3
3.4 Change local time
The local time is based on the system time UTC and differs from this according to
the time zone and any daylight saving time change to be taken into account.
Click on "Properties.." in the pop-up menu of your S7-1200 PLC. In the dialog
window that opens you go to the "General" tab and click on the "Time of day" item.
In the "local time" drop-down list, you select your time zone in the form of
GMT+xx". By checking the relevant check box you can change the "Activate
daylight saving time" parameters.
Click on the "OK" button.
Figure 3-4

hmi_time_sync_how_to_e

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